Arrangement fob wireless teleg



Oct. 24, 1933. A. LEIB Re. 18,972

ARRANGEMENT FOR WIRELESS TELEGRAPHY AND TELEPHONY Original Filed March 26, 1923 If I 5 INVENTOR AUGUST LEIB ATTORNEY Reissued Oct. 24, 1933 ARRANGEMENT 18,912 g FOR WIRELESS TELEG APHY AND TELEPHONY August Leib, Berlin, Germany, assignor to Telefunken Gesellschaft fur Drahtlose Telegraphic mit beschrankter Haftung, Berlin, Germany, a corporation of Germany Original No. 1,v54,s2s, aatea April 15, 1930, Serial No. 627,828, March 26, 1923, and in Germany July 4, 1922.

Application for reissue Septembe! 26, 1930. Serial No. 484,672

18 Claims. ((1250-27) The present invention; relates to an arrangement for wireless telegraphyand telephony and is particularly intended for use in receivers in which a device, which operates in synchronism 5 with the varying tuning means, is employed to render the indicator such as a detector, an amplifier, a telephone, etc., ineffective for certain points or parts of a wave band. Due to this arrangement at certain selectable points of the band of wave lengths to which the receiver may be tuned by the tuning means, receiving is made impossible, and therefore these bands or ranges may be barred fromge. g., unauthorized radio receiving. This may be attained by a switch device which is mechanicallyconnected with the variable condenser or variometer of a tuned circuit of the receiver. By this'device the detector, the telephone receiver or the amplifier circuits may be temporarily disconnected or short circuited so as to prevent reception.

Fig. 1 of the drawing schematically illustrates one embodiment of my invention, Fig. 2 is a modified form showing a connection to interrupt the anode circuit of thetube, and Fig. 3 is another modified form showing-a connection to short-circuit the telephone receiver. The parts not shown'i n'Fig. 2 are similar to those of Fig. 1 and the connections likewise similar.

As shown, a disc 1 having a toothed periphery is fixed on the shaft of the-variable condenser 2.

of an oscillating circuit in a receiver. This disc cooperates with a contact device 3 and causes the opening and closing of this contact when during the rotation of the disc the contact engages depressed and raised portions respectively of its toothed periphery. The tuned circuit is completed by the self induction 4, and its tuning will continuously pass through the wave band of the receiver while the condenser 2 is being rotated. An indicator such, for example, as an audion 5 with a telephone receiver 6 is connected with the oscillating circuit of the receiver. The contact device 3 is in the conductor leading from the r tuned circuit to the audion and will interrupt this connection while the movable member of contact device 3 rests in a notch of the disc 1. For this reason, receiving is preventedover a corresponding portion of the wave band. Obviously, the interruption may be effected in another part of the circuit arrangement of the receiver e. g. in the anode circuit of the tube, the heating circuit, etc.

The arrangement shown in Fig. 2 is similar to the arrangement shown in Fig. 1 except that in Fig. 2 the anode circuit is nterrupted by the eon- ;tact device 1 and 3.

The arrangementshown in Fig. 3 is similar to the arrangement shown in Fig. 2, except that in Fig. 3-, the telephone receiver. 6,. or sound reproducer, is short-circuitedby the contact device 1 and 3. As in Fig. 1', the disc lcooperates with the contact device 3 and causes short-circuiting of the reproducer 6 when during'the rotation of the disc the contact engages depressed portions of its toothed periphery,the' reproducer being rendered effective whenever the. contact engages raised portions of the toothed periphery of ;the

disc.- I The invention is particularly intendedfor use in receiving apparatus in which thecondenser ,2

is continuously operated to repeatedly vary the tuning of the receiver over a band of wave lengths. Having described my invention, what Iclaim is:

1. In a'high frequency receiving system,. a resonant circuit, means for varying the tuning of' the circuit, a second circuit, andmeans operated by said tuning varying meansforbreaking said second circuit to prevent reception at certain wave lengths. 2. In a high frequency receiving system, receiving means, a signal responsive device,-- and means for continually and periodically placing said signal responsive device into and out of operative relation with said receiving .means atpredetermined separatedvalues-ofthe incoming signal wave lengths.

3. In a high frequency receiving system, a'

resonance circuit, means for continuously and periodically varying the tuning of said circuit through a band of wave lengths, and means for preventing reception atpredetermined separated wave lengths of the band. 1

4. In a high frequency receiving system, a resonance circuit, means for continuously and repeatedly varying the tuning of said circuit through a band of wave lengths-and means operatedby said first means for preventing reception at predetermined separated wave lengths of the band to which said receiving system is responsive.

5. In a high frequency receiving system, a resonant circuit, means for continuously and repeatedly varying the tuning of the circuit, and means operated by said tuning varying means for preventing reception at certain predetermined separated wave lengths in the signal bandto which said receiving system is responsive.

6. In a high frequency receiving system, a

. ond circuityand means operuted by saddtuning varying means for continuously and repeatedly breaking said second circuit to prevent reception denser-controlling means for rendering said 7. In a high frequency receiving system, a"

lengths.

at certain wave lengths.

circuit having a tuning devicetherein, I .sll nal responsive device, circuit breaking means for" controlling said signal responsive device, and rotating means for operatmg said tuning. devicev and said circuit breaking means simultaneously continuously and repeatedly;

8. In a high frequency receiving system, Q a

resonance circuit having a tumng device therein,

an audion tube having input and output circuits,

said input circuit being coupled to said resonance.

circuit, a circuit interrupter having contacts in one 01' said tube circuits, rotating means for con trolling said tuning device and said circuit interrupter fimuitaneouslm'and a 'telephone'insaid I output circuit.

'9:"In a; rrequeneyr'eceiving system, a resonance circuit including a condenser, means rmcontrolling said eondenser to vary-the reso nant '0! said circuit, asecond circuit,

and by said cmuenser-controi- 1mg meeiis fc making and breaking saidsecond drew: to at eermmwav gths 1 10; In a receiving 'mgemem "for wireless telegqaphy-and'teiephony, a resonant circuit, a

contihuousiyfmbed condenser for continuously and repeatedly varying the tuning of the circuit throngha bend of wave lengths, a disc momited slim orthe 'oondenseriandhaving a toothed and contacts controlled by and disc for breaking a circuit oI-the arrangemean so as to prevent reception at certain of the wave lengths in said band.

11. m commotion with a radio receiver wing orepiod'ucer thereto, means tor'tun'-' mg the-receiver, and 'moans'controlied "by-the tuning means to render flie'reproducer ineflective curing predetermined periods of the tuning process. V

Hg. In! high" nequenc receiving system," a

- resonant circuit, mm tor varyingthe tuning or the circuitg=n second circuit including a, signal mdicater, and meansperatedby said tuning varying means rerfremenng min second circuit inelecuve certain wave Y i 13. In a 'high frequency receiving system, a.

resonant circuit including a condenser, means for,

(xmtrdlling, saidcondenser to vary the resonant frequency of the circuit, a second circuit including a reproducer, and means operated by said conmined wavelengths for rendering said reproducer ineffective.

; l5. a high frequency system, a resonant circuit, meansfor varying the tuning of said circuit "through a bandof wave lengths, a signal indi- "catonand means 'for rendering the indicator ineffective. between predetermined separated wave lengths of the band. I V

"16'. In a device for conditioning a radio receiver to] receive waves from selected stations,- said receiver having a circuit including asound reproducer connected thereto, means to open the reproducer circuit during predetermined periods of the process of conditioning the receiver to receive'a selected station. I 1 I llJIn a high frequency receiving system, a resonant circuit, a tube having its input electrodes ooupled'to said circuit, a soundreproducer coupled to the output electrodes of said tube, means for varying the tuning of sad circuit through a signal frequency rangeand means for rendering the tube ineflicient when said tuning means is varied; between predetermined separated ireoffsaid range whereby said reproducer inefiective between said last named frequencies." m

18: In cl-radio telephonereceiver, a tube provided with at leasta cathode,' signal grid and anode, a resonant signal network coupled to the grid and cath'ode of the tube, a variable tuning condenser in said network for tuning said receiver through ajsign'al frequency range, a sound re producer, coupled to the anode circuit of said tube, andime'ans for rendering the tube inefficient during'theproce'ssof timing the receiver to receive a desired signal frequency whereby undesired sounds are prevented.

AUGUST LEIBp 

